Paint brush



FIG. 1 is a perspective view of a paint brush showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is an enlarged view of the selected portion in FIG. 1.

The broken lines shown in the drawings depict portions of the paint brush in which the design is embodied that form no part of the claimed design. 

CLAIM The ornamental design for a paint brush, as shown and described. 